Mixtures of cyclic branched siloxanes of the D/T type and conversion products thereof

US10752735B2 · kind B2 · utility

Assignee

• Evonik Operations GmbH · DE

Inventors

• Wilfried Knott · Essen, DE
• Horst Dudzik · Essen, DE

Key dates

• Filing date: Nov 14, 2018
• Grant date: Aug 25, 2020
• Expiry date: Nov 14, 2038

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/70
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Mixtures of cyclic branched siloxanes having exclusively D and T units and having no functional groups, with the proviso that the cumulative proportion of the D and T units having Si-alkoxy and/or SiOH groups that are present in the siloxane matrix, determinable by 29Si NMR spectroscopy, is ≤2 mole percent, are described, as are branched organo-modified siloxanes obtainable therefrom.